JPWO2008032427A1 - 摺動部材とそれを用いた軸受 - Google Patents
摺動部材とそれを用いた軸受 Download PDFInfo
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- JPWO2008032427A1 JPWO2008032427A1 JP2008534235A JP2008534235A JPWO2008032427A1 JP WO2008032427 A1 JPWO2008032427 A1 JP WO2008032427A1 JP 2008534235 A JP2008534235 A JP 2008534235A JP 2008534235 A JP2008534235 A JP 2008534235A JP WO2008032427 A1 JPWO2008032427 A1 JP WO2008032427A1
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- silicon nitride
- sliding member
- sintered body
- nitride sintered
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
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Abstract
Description
まず、酸素含有量が1.3質量%、不純物陽イオン元素としてのLi、Na、K、Fe、Ca、Sr、Ba、Mn、Bの合計含有量が0.15質量%、α相型窒化珪素の割合が97質量%で、平均粒径が0.55μmの窒化珪素粉末を用意した。この窒化珪素粉末に対して、焼結助剤として平均粒径が0.7μmの酸化イットリウム粉末を7質量%、平均粒径が0.5μmの酸化アルミニウム粉末を2質量%、平均粒径が1.0μmのHfO2粉末を2質量%の割合で添加し、これらをエチルアルコール中で72時間湿式混合した後に乾燥して原料混合粉末を調製した。
表1に示す窒化珪素粉末(α相型窒化珪素の割合:97質量%、平均粒径:0.55μm)に、それぞれ焼結助剤を表1に示す組成で添加した後、実施例1と同様に混合して各原料混合粉末を調製した。これら原料混合粉末に有機バインダを所定量添加して混合した後にCIP法で成形した。得られた各成形体を空気気流中で脱脂した後、不活性雰囲気中にて常圧焼結した。さらに、各常圧焼結体に対してHIP処理を施すことによって、目的とする窒化珪素焼結体をそれぞれ得た。
焼結助剤としての酸化イットリウム粉末の添加量を6質量%とする以外は、実施例1と同様にして窒化珪素焼結体(比較例1)を作製した。M化合物粉末を添加しない以外は、実施例1と同様にして窒化珪素焼結体(比較例2)を作製した。不純物陽イオン元素量が0.35質量%の窒化珪素粉末を使用する以外は、実施例1と同様にして窒化珪素焼結体(比較例3)を作製した。これら窒化珪素焼結体中の粒界相について、結晶化合物相の割合、平均粒径、最大粒径を測定した。測定結果を表2に示す。さらに、各窒化珪素焼結体を後述する特性評価に供した。
実施例1と同組成の原料混合粉末を用いて、表4に示す条件下で窒化珪素焼結体をそれぞれ作製した。表4に示す条件以外は実施例1と同様とした。これら各窒化珪素焼結体の微構造(粒界相に占める結晶化合物相の割合、窒化珪素結晶粒に占めるアスペクト比が2以上の柱状粒の割合、柱状粒の最大長さ)を前述した方法にしたがって測定した。これらの測定結果を表4に示す。測定は焼結体の断面4箇所を任意に選び、各断面に対して1000倍の視野で実施した。これら4箇所の測定結果の平均値を示す。さらに、各窒化珪素焼結体の特性を実施例1と同様にして測定した。これらの測定結果を表5に示す。
実施例1〜20および比較例1〜3と同組成および同条件で作製した窒化珪素焼結体で、それぞれ直径2mmのベアリングボールを作製した。ベアリングボールの表面はグレード3で表面研磨した。これら各ベアリングボールの転がり寿命を以下のようにして測定した。転がり寿命試験はスラスト型軸受試験機を用い、SUJ2鋼製の平板(相手材)上を回転させることにより実施した。転がり寿命は最大接触応力5.9GPa、回転数1200rpmで試験し、100時間および400時間の継続試験が可能であるかどうかを判定した。それらの結果を表6に示す。
Claims (20)
- 焼結助剤として希土類元素を酸化物に換算して7〜18質量%の範囲、Ti、Zr、Hf、Mg、V、Nb、Ta、Cr、MoおよびWから選ばれる少なくとも1種の元素Mを酸化物に換算して0.1〜3質量%の範囲で含有すると共に、不純物陽イオン元素としてのLi、Na、K、Ca、Sr、Ba、Fe、MnおよびBの合計含有量が0.3質量%以下である窒化珪素焼結体を具備する摺動部材であって、
前記窒化珪素焼結体は窒化珪素結晶粒と粒界相とを備え、前記粒界相に占める結晶化合物相の割合が面積比で20%以上であると共に、前記結晶化合物相の平均粒径が0.5μm以下であり、かつ60W/m・K以上の熱伝導率を有することを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記窒化珪素焼結体は、さらにアルミニウムを酸化物に換算して0.3〜4質量%の範囲で含有することを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記粒界相中の前記結晶化合物相の最大粒径が1μm以下であることを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記窒化珪素焼結体の気孔率が0.1%以下であることを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記粒界相中の前記結晶化合物相の平均粒径が0.3μm以下であることを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記窒化珪素焼結体は、前記希土類元素と前記元素Mをそれらの合計量として、酸化物換算で20質量%以下の範囲で含有することを特徴とする摺動部材。 - 請求項2記載の摺動部材において、
前記窒化珪素焼結体は、前記希土類元素と前記アルミニウムと前記元素Mをそれらの合計量として、酸化物換算で20質量%以下の範囲で含有することを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記元素MはTi、Zr、Hf、Mg、TaおよびMoから選ばれる少なくとも1種であることを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記元素MはTi、Zr、Hf、Mg、TaおよびMoから選ばれる2種以上であることを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記窒化珪素焼結体は1300〜1500の範囲のビッカース硬さを有することを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記窒化珪素焼結体は5.0MPa・m1/2以上の破壊靭性値を有することを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記窒化珪素焼結体は650MPa以上の3点曲げ強度を有することを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記窒化珪素焼結体は150N/mm2以上の圧砕強度を有することを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
前記窒化珪素結晶粒に占めるアスペクト比が2以上の柱状粒の割合が面積比で50%以上であることを特徴とする摺動部材。 - 請求項14記載の摺動部材において、
前記柱状粒の最大長さが40μm以下であることを特徴とする摺動部材。 - 請求項1記載の摺動部材において、
軸受用転動体であることを特徴とする摺動部材。 - 請求項1記載の摺動部材からなる転動体を具備することを特徴とする軸受。
- 請求項17記載の軸受において、
前記窒化珪素焼結体は前記粒界相中の前記結晶化合物相の最大粒径が1μm以下であることを特徴とする軸受。 - 請求項17記載の軸受において、
前記窒化珪素焼結体の気孔率が0.1%以下であることを特徴とする軸受。 - 請求項17記載の軸受において、
前記窒化珪素焼結体中に含有される前記元素MはTi、Zr、Hf、Mg、TaおよびMoから選ばれる1種または2種以上であることを特徴とする軸受。
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